Ok, that's odd.
I ran /usr/src/build.sh (as ./build.sh) with:
-D /disk2/f/sparc64/dest -R /disk2/f/sparc64/release -a sparc64

It completed, but it never started doing the release thing (kernels, sets,
...)
and now that I look, every binary under /disk2/f/sparc64/dest is a 32-bit
NetBSD/i386 ELF binary. did I do something wrong?

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